Artificial-tooth mount.



- PATENTED SEPT. 1, 1908.

'S. S. BLOOM.

ARTIFICIAL TOOTH MOUNT.

APRLIUATIOR FILED JAN. 3, 1908.

To all whom it may concern:

PATENT OFFICE.

SAMUEL S. BLOOM, OF PHILADELPHIA, PENNSYLVANIA.

sn'rmlcrsn-roorn MOUNT.

No. semis.

flpeoiflcationof Letters Patent.

Patented-Sept. 1, mos.

s uuau mwi January is, 1908. Serial No. 409,1.

Be it known that'I, SAMUEL S. BLooM, a citizen of the United States, residin at -Philadelphia, in the county of Philade phia and State of Pennsylvania, have invented certain new and useful Im rovements in Artificial-Tooth- Mounts, of w ich the followis a specification. his invention relates to artificial teeth and has for its object the provision of improved means which permit the dentist to conveniently and securely attach the artificial tooth'or front, made of porcelain or other suitable material, to, the metallic backingor plate' by means of which the denture is secured in position.

. While in present invention is capable of being emp oyed in connection with various forms of artificial teeth, I have illustrated in the accompanying-drawings only an incisor. But it is to be understood that I do not limit myself to the special form shown.

Heretofore, in the manufacture of artificial teeth which have plates or backs to which the porcelain fronts are secured, it has been common to mold and bake the porcelain tooth with a-vertical recess in which the pin or rib carried b the back late is cemented. It .is practice 1y impossiblie to complete. the tooth by the molding and bakingoperation fwith 'a cbrrectlyi-formed recess which is to receive the pin; and itghas therefore been customarily to drill out the recess so that the in will t snugly. '-In practice, a partially orrned recess is molded, and the correct form isgiven thereto by the use of -a diamond drill 1 after the tooth has been baked. 'Thisis an;

on] a an expensive operation due to the 0081 oft e drills and the time required in drilling," but-it is almost impossible to drill out the recesses with uniform accuracy. The drillis liabl'eto go too deep or not far enough, or

tooth body after the baking to ream out the recess not in the exact lateral position which it should have.- The especial object of my present invention is to provide a construction which will insure accuracy in the shape and location of the recess in the operation.

To these ends the invention consists in the construction and combination of parts substantially as hereinafter described and claimed. Of theaccom anying drawings :Figures 1" and 2 are reatively an elevation and a longitudinal section, on a larger scale, of one form of tooth to which my invention is on ine 33 of Fig. 2. Fi views similar to Fig. 3 and i ustrating' other cross sectional forms of the longitudinal recess and lining. Fi 6 is a sectional view, on a larger scale than big. 3, of the plate and rib and pin. a r Similar reference characters indicate the same 'or similar parts in all of the figures of the drawings.

The tooth body 10 is molded with a longitudinal recess having a lining 11 which may be of platinum or. other suitable refractory material. The lining is in the form of a spht tube, but it is to-be understood that bythe word tube, 1 do not limit myself to one which is circular in section. It ma be reptang'ular or somewhat dovetailed in shape. But it must besp'lit or open along the side an suitab e' -way dur nglt-t tdhldmg and be nghoperations. Wheathspme l in body is finis ed, its longitudinal or'vert'ical recess is provided with a lining improper shapeun cross section to receive acorrespondingly sha ed pin-which is carried b the plate.

wing to the fact that the g must be in a position a little away from the rear face of the tooth body so that suflicient strength will be possessed by the latter at the edges of the vertical opening, it is essential that the pin 12 shall carried by the plate 13 at a slight'distance therefrom. That is, it would notdoto-jeihploy a perfectly flatplate and secure directly in contact therewith, as therewould then not be snfii zspface 1n theang'ular recess at each side of the pin to permit t e tooth body to slip to pro er psitio'ir; In order to make, the pin stan 'a ttle' away from the plate when secured a slight rib 14 the upper s ace of which-is properly formed to render it certain that when the pin is fastened to said rib they will be 111 proper alinernen'ti When a in which is circular in cross section is emp oyed, the upper face of the rib is slightly concaved to receive the convex side of the pin as shown in Fig. 6. This shape co-acts with the solder when the latteris applied, to form a durable connection between the plate and pm. If

sunilarly formed.

thereto, the plate is struck u so as to form the pin is angularin cross section the faceof above gtated, the used in the tooth.

ada ted. Fig. 3 represents a cross section 4 and 5 are which is to communicate with the'open side of the recess ofthe tooth'-body'. Said lining. l tactics-supports in thejmold n cient' a soft solder.

tooth body. But if body is to have a shape in cross section cor-' responding to the cross section of the portion whlch stands away from the plate.

When the dentist connects a r0 erly shaped and properly shaded tooth or y to the plate he usually employs cement to se cure theend of the in in the recess of the e finds that a particu lar atient generates a saliva acid which is liab e to dissolve'the cement he may employ This could not be done with a tooth having no metal lining since the solder would not adhere properly to the wall of an unlined recess in a porcelain tooth. But of course it will be understood that the teeth are not sold or furnished with pins already soldered in the recesses.

Preferably I furnish the connected pins and plates with the pins of a length pro ect ing considerably beyond the plates, w ich ins can be left full length or can be cut off y the dentist according to the use to which he intends to put the tooth. For crown work or pivot teeth, the pin will be left so that it can be secured in the drilled cavity in the root. For bridge work, the pin will. be cut off by the dentist. The pin may be roughen'ed or corrugated and may be given any suitable shape in cross section so that it can-be firmly secured in a drilled root cavity without liability of turning. If a atient has entltely'lost a tooth next to one w has to plate car- 'rfiingthe pin may be of suflicient width so i t at said plate may carry not only the ivot tooth or crown but also one or more ac jacent complete artificial teeth, thus form- I ing a combination pivot and bridge device. I As shown in Fig. 2, thetooth is formed with a ledge 15 against which the lower edge of the 1 plate abuts. In practice this lodge is so i ormed, relatively to the ion th of the lined recess, that the edge of the plate abuts against the said ledge as the end of the )in reaches the bottom of the lined recess. iis aflords additional sup ort for endwise pressure'instead of depend bottom. of the recess lower end-of the pin.

Having now described my claim is 1. A back plate for an artificial tooth mount having a portion thereof struck up to form a rib, and a pin secured to the upper face of said rib.-

2. A back plate for an artificial tooth mount having a portion thereof struck up to form a rib, and a pin-secured to the upper face of said rib, the face of said rib being depressed to receive a portion of said pin.

In testimony whereof I affix my signature, in presence of two witnesses.

' SAMUEL S. BLOOM.

bearing against the invention, what ing entirely upon the Cir 

